C# – HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

ccomnetwindows

I am building a GIS Application but whenever I run the code it's giving me this error

System.Runtime.InteropServices.COMException was unhandled
Retrieving the COM class factory for component with CLSID {FBF5715D-A05D-11D4-A64C-0008C711C8C1} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

Also, in the Project Properties the Option for Register For COM Interop is disabled.

Best Answer

This could also be an issue of building the code using a 64 bit configuration. You can try to select x86 as the build platform which can solve this issue. To do this right-click the solution and select Configuration Manager From there you can change the Platform of the project using the 32-bit .dll to x86

Related Solutions

.net – Retrieving the COM class factory for component with CLSID {XXXX} failed due to the following error: 80040154

In VS - project properties - in the Build tab - platform target =X86

C# – Strange error on Excel Workbook input

I suppose that in your code the fullname of Workbook is Microsoft.Office.Interop.Excel.Workbook, and that excel is an instance of Microsoft.Office.Interop.Excel.Application.

If this is the case your code can't work because Workbook is an interface, and interfaces do not have constructors. You have to ask the excel application to create the workbooks for you, and in your case you have to simply write:

Workbook wb = excel.Workbooks.Open(currentPath);

In a similar way, if you want to create a new empty workbook, you should write:

Workbook wb = excel.Workbooks.Add(System.Reflection.Missing.Value);